drm/v3d: Add support for bcm2711

Add compatible string and Kconfig options and help for bcm2711.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Reviewed-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Melissa Wen <melissa.srw@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220603092610.1909675-4-pbrobinson@gmail.com

drivers/gpu/drm/v3d/Kconfig

 # SPDX-License-Identifier: GPL-2.0-only
 config DRM_V3D
 	tristate "Broadcom V3D 3.x and newer"
-	depends on ARCH_BCM || ARCH_BRCMSTB || COMPILE_TEST
+	depends on ARCH_BCM || ARCH_BRCMSTB || ARCH_BCM2835 || COMPILE_TEST
 	depends on DRM
 	depends on COMMON_CLK
 	depends on MMU
@@ -9,4 +9,5 @@ config DRM_V3D
 	select DRM_GEM_SHMEM_HELPER
 	help
 	  Choose this option if you have a system that has a Broadcom
-	  V3D 3.x or newer GPU, such as BCM7268.
+	  V3D 3.x or newer GPUs. SoCs supported include the BCM2711,
+	  BCM7268 and BCM7278.

drivers/gpu/drm/v3d/v3d_drv.c

@@ -191,6 +191,7 @@ static const struct drm_driver v3d_drm_driver = {
 };
 
 static const struct of_device_id v3d_of_match[] = {
+	{ .compatible = "brcm,2711-v3d" },
 	{ .compatible = "brcm,7268-v3d" },
 	{ .compatible = "brcm,7278-v3d" },
 	{},